Brew on Premise is not uncommon. Usually they have steam jacketed kettles that you use. They supply everything (at a very nominal price). You brew on their equipment, use their ingredients, ferment in their carboy/bucket, they generally force carbonate it and then you bottle off of their keg.
Bringing your equipment into their brewery is most likely against the law and/or against their insurance policies. As such, I highly doubt that this is the case.
That which does not kill us makes us stronger. - Friedrich Nietzsche
Primary: Amarillo IPA
Secondary: Dark Cherry Sour '14
Secondary: Pom-Cran Sour '14
Keg #1: Amarillo Pale Ale
Keg #2: California Honey Amber
Keg #3: Dread Not Sweet Stout
Keg #4: Chocolate Vanilla Imperial Porter
Bottled: Pom-Cran Sour '13, Dad's Apple Pie Cider
On-Deck: Golden Spike Belgian Rye, Amarillo Series Ales